Excretory System. Ewww! Giggle, giggle. Digestive System Respiratory System Skin Urinary System. H 2 O, undigested food H 2 O, CO 2 H 2 O, salts H 2 O, salts, poisons Why do we need to drink lots of water?. Excretion. Regulating Fluids. Hypothalamus – in mid-brain
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